Dynamic displacement monitoring of long-span bridges with a microwave radar interferometer

Structural health monitoring of long-span bridges is a critical process in ensuring the operational safety of the structures. In this paper, we present experimental results of monitoring the displacements of two long-span bridges in Hong Kong Ting Kau Bridge (TKB) and Tsing Ma Bridge (TMB) with a te...

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Bibliographic Details
Published in:ISPRS journal of photogrammetry and remote sensing 2018-04, Vol.138, p.252-264
Main Authors: Zhang, Bochen, Ding, Xiaoli, Werner, Charles, Tan, Kai, Zhang, Bin, Jiang, Mi, Zhao, Jingwen, Xu, Youlin
Format: Article
Language:English
Subjects:
Displacements
Dynamics
Long-span bridge
Microwave radar interferometer
Structural health monitoring (SHM)
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Summary:Structural health monitoring of long-span bridges is a critical process in ensuring the operational safety of the structures. In this paper, we present experimental results of monitoring the displacements of two long-span bridges in Hong Kong Ting Kau Bridge (TKB) and Tsing Ma Bridge (TMB) with a terrestrial microwave radar interferometer named the GAMMA Portable Radar Interferometer (GPRI). A technique for fusing the measurements from two receiving antennas of the radar instrument is proposed. In addition, a two-step phase unwrapping approach is also tested. The results reveal the bridge dynamic responses under different loading conditions, including winds, vehicle traffic, and passing trains. The results also show that the terrestrial microwave radar interferometer can be used to monitor the dynamics of long-span bridges with unprecedented spatial and temporal resolutions.
ISSN:0924-2716
1872-8235
DOI:10.1016/j.isprsjprs.2018.02.020